a: \(=y\left(x+1\right)-z\left(x+1\right)=\left(x+1\right)\left(y-z\right)\)
b: \(=3x\left(x-y\right)-5\left(x-y\right)=\left(x-y\right)\left(3x-5\right)\)
c: \(=3x^2-9xy-xy+3y^2\)
\(=3x\left(x-3y\right)-y\left(x-3y\right)=\left(x-3y\right)\left(3x-y\right)\)
d: \(=2x^2-4x-x+2=\left(x-2\right)\left(2x-1\right)\)


